Rheem HVAC Error Code 23: How to Fix It

Q: What causes Rheem error code 23 to appear?

Error code 23 appears when the pressure switch detects improper venting during operation. This is typically caused by partial blockages in the exhaust or intake vents, condensate backup, or damaged vent components that restrict proper airflow.

Q: Can I reset Rheem error code 23 myself?

The error will reset automatically once the underlying vent blockage issue is resolved. Simply clearing the blockage and restarting the system should eliminate the error code. There's no manual reset button for this specific error.

Q: Is it safe to run my Rheem furnace with error code 23?

No, do not attempt to run the furnace with error code 23. This error indicates a potential safety hazard with improper venting that could lead to carbon monoxide buildup. The system will not operate until the issue is resolved.

Q: How often should I clean my Rheem HVAC vents?

Inspect and clean exterior vents at least twice yearly, typically before heating and cooling seasons. Check more frequently if you live in areas with heavy debris, frequent storms, or if pets or wildlife are present near the vents.

Q: What's the difference between error code 23 and other pressure switch errors?

Error code 23 specifically indicates the pressure switch opened during operation due to partial blockage. Other pressure switch errors may indicate complete blockages, switch failure, or different timing issues during the startup sequence.

Abstract

Rheem HVAC error code 23 indicates the pressure switch opened during operation due to a partial vent blockage. This safety feature prevents dangerous exhaust gas buildup by shutting down the system when proper venting is compromised.